Add postmark as output binding

daprdocs/content/en/operations/components/setup-bindings/supported-bindings/_index.md

@@ -20,14 +20,14 @@ Every binding has its own unique set of properties. Click the name link to see t
 | [Kubernetes Events]({{< ref "kubernetes-binding.md" >}}) | ✅ |    | Experimental |
 | [MQTT]({{< ref mqtt.md >}})           | ✅ | ✅ | Experimental |
 | [PostgreSql]({{< ref postgres.md >}})       |    | ✅ | Experimental |
+| [Postmark]({{< ref postmark.md >}})       |    | ✅ | Experimental |
 | [RabbitMQ]({{< ref rabbitmq.md >}})   | ✅ | ✅ | Experimental |
 | [Redis]({{< ref redis.md >}})         |    | ✅ | Experimental |
 | [Twilio]({{< ref twilio.md >}})       |    | ✅ | Experimental |
 | [Twitter]({{< ref twitter.md >}})       | ✅ | ✅ | Experimental |
 | [SendGrid]({{< ref sendgrid.md >}})       |    | ✅ | Experimental |
 
-
-### Amazon Web Service (AWS)
+### Amazon Web Services (AWS)
 
 | Name | Input<br>Binding | Output<br>Binding | Status |
 |------|:----------------:|:-----------------:|--------|
@@ -37,7 +37,6 @@ Every binding has its own unique set of properties. Click the name link to see t
 | [AWS SQS]({{< ref sqs.md >}})           | ✅ | ✅ | Experimental |
 | [AWS Kinesis]({{< ref kinesis.md >}})   | ✅ | ✅ | Experimental |
 
-
 ### Google Cloud Platform (GCP)
 
 | Name | Input<br>Binding | Output<br>Binding | Status |
@@ -55,4 +54,4 @@ Every binding has its own unique set of properties. Click the name link to see t
 | [Azure Service Bus Queues]({{< ref servicebusqueues.md >}}) | ✅ | ✅ | Experimental |
 | [Azure SignalR]({{< ref signalr.md >}})                     |    | ✅ | Experimental |
 | [Azure Storage Queues]({{< ref storagequeues.md >}})        | ✅ | ✅ | Experimental |
-| [Azure Event Grid]({{< ref eventgrid.md >}})                | ✅ | ✅ | Experimental |
+| [Azure Event Grid]({{< ref eventgrid.md >}})                | ✅ | ✅ | Experimental |

daprdocs/content/en/operations/components/setup-bindings/supported-bindings/postmark.md

@@ -0,0 +1,69 @@
+---
+type: docs
+title: "Postmark binding spec"
+linkTitle: "Postmark"
+description: "Detailed documentation on the Postmark binding component"
+---
+
+## Setup Dapr component
+
+```yaml
+apiVersion: dapr.io/v1alpha1
+kind: Component
+metadata:
+  name: postmark
+  namespace: default
+spec:
+  type: bindings.postmark
+  metadata:
+  - name: accountToken
+    value: "YOUR_ACCOUNT_TOKEN" # required, this is your Postmark account token
+  - name: serverToken
+    value: "YOUR_SERVER_TOKEN" # required, this is your Postmark server token
+  - name: emailFrom
+    value: "testapp@dapr.io" # optional
+  - name: emailTo
+    value: "dave@dapr.io" # optional
+  - name: subject
+    value: "Hello!" # optional
+```
+
+- `accountToken` is your Postmark account token, this should be considered a secret value. Required.
+- `serverToken` is your Postmark server token, this should be considered a secret value. Required.
+- `emailFrom` If set this specifies the 'from' email address of the email message. Optional field, see below.
+- `emailTo` If set this specifies the 'to' email address of the email message. Optional field, see below.
+- `emailCc` If set this specifies the 'cc' email address of the email message. Optional field, see below.
+- `emailBcc` If set this specifies the 'bcc' email address of the email message. Optional field, see below.
+- `subject` If set this specifies the subject of the email message. Optional field, see below.
+
+You can specify any of the optional metadata properties on the output binding request too (e.g. `emailFrom`, `emailTo`, `subject`, etc.)
+
+Combined, the optional metadata properties in the component configuration and the request payload should at least contain the `emailFrom`, `emailTo` and `subject` fields, as these are required to send an email with success.
+
+Example request payload
+
+```json
+{
+  "operation": "create",
+  "metadata": {
+    "emailTo": "changeme@example.net",
+    "subject": "An email from Dapr Postmark binding"
+  },
+  "data": "<h1>Testing Dapr Bindings</h1>This is a test.<br>Bye!"
+}
+```
+
+{{% alert title="Warning" color="warning" %}}
+The above example uses secrets as plain strings. It is recommended to use a secret store for the secrets as described [here]({{< ref component-secrets.md >}}).
+{{% /alert %}}
+
+## Output Binding Supported Operations
+
+- `create`
+
+## Related links
+
+- [Bindings building block]({{< ref bindings >}})
+- [How-To: Trigger application with input binding]({{< ref howto-triggers.md >}})
+- [How-To: Use bindings to interface with external resources]({{< ref howto-bindings.md >}})
+- [Bindings API reference]({{< ref bindings_api.md >}})